walk-in cooler pin function
walk-in cooler pin function
reset: CPU pin 27 is the reset terminal. After the walk-in cooler is powered on, reset circuit IC6 (KIA7042P) generates a low-level reset signal. After a period of time, when the input voltage of pin 27 of the CPU is 5V, the internal circuit of the chip returns to the initial state. 6 clock oscillation, pins 1 and 2 of the CPU are the clock signal input and output terminals. After the CPU reset is completed, Cooperate with the external OSCl clock oscillating crystal to generate oscillating pulses, coordinate the work of various parts after frequency division, and act as a pulse source for the CPU to output various control signals. Refrigeration principle After the CPU works, it will output the boot command from pin 20, and the pin 3 of IC4 will be amplified and output by pin 14, control the RYl relay to pull in, connect the compressor and fan motor circuit, start the compressor and fan to run at the same time, implement Refrigeration and cooling.
At the same time, the CPU detects the refrigeration effect of the freezer compartment from pin 11, and if it reaches the set temperature, it will make pin 20 output the stop command, the compressor and fan will stop, and the cooling will be terminated. The CPU actually determines the temperature of the freezer compartment by detecting the voltage of pin 11, because the voltage of pin 11 is determined by an external resistor, which includes R20, RFl and walk-in cooler freezer temperature sensor. The first two are fixed resistors, the latter is the freezer temperature sensor is a thermistor, its resistance increases as the temperature drops, so that the 11 pin voltage of the CPU increases. In this way, the CPU should judge the current temperature of the freezer according to the different voltage values of pin 11.
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